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xx-ray

v2.0.2

Published

crawler

Downloads

4

Readme

這是基於 x-ray 改來的 crawler

使用範例

看 example.js

新增功能

- setConfig(obj) 可設定各種參數

	xray.setConfig({
		limit: 2,
		paginate: 'ul li'
	})

- limit 可給 Infinity 就會所有頁面全抓,給 2 就只抓兩頁

- .paginate() 功能已修正,原本同一頁會抓兩次,然後第三頁就爛掉

- 每抓完一頁會詢問是否要繼續
	- pageEventHandler() 內 return false 即可 cancel

- 抓取中能看到 progress or event 嗎?
	- 因為我想判斷每條新聞的日期再決定是否要抓下頁

	← 沒辦法,因為是以整頁為單位先抓下來,然後走訪頁面上的10筆資料
	- 只能在 pageEventHandler 內判斷這批抓回來的10筆資料是否已重覆了,然後 return false 取消掉後續抓取
		- 並且將重覆的幾條 item 給刪掉

我改掉的部份

- 將所有 chaining method 全拿掉,參數改用 config 傳入

- write() 也會觸發 node() 再跑一次,能一律改成 promise 版嗎?
	- 這些列在 methods[] 中的指令已全拿掉

為何要用這個 lib 為基礎來改?

- 可明確標示出 target graph 的結構,很清楚要抓哪些欄位,與它們相應的 query string
- 可用 [{}] 來表示是要抓 Array of items
- 因為他是 cheerio 作者,原本以為應該會很優

下一步

- 目前此份 code 堪用,將來大規模 scale 時再找時間回來重寫